Frank Ragnow's retirement means the backup center job is up for grabs, and the Lions don't have much depth at defensive end.

Brodric Martin needs a consistently impressive training camp and preseason to keep his career as a Detroit Lions DT for a third year ...

Of those nine defenders, O'Connor possesses the best shot of making the team out of training camp. The versatile lineman is capable of lining up as both an EDGE and a 3-tech or 5-tech on the interior.

Detroit's defensive line will also get a boost at some point with the return of defensive tackle Alim McNeill, whose late-season torn ACL is expected to hold him out of action to begin the regular ...

Defensive line (9) In: Aidan Hutchinson, Marcus Davenport, DJ Reader, Levi Onwuzurike, Tyleik Williams, Josh Paschal, Roy Lopez, Pat O’Connor, Ahmed Hassanein. PUP list: Alim McNeill, Mekhi Wingo.